Riveting tongs for blind rivets

ABSTRACT

Hand riveting tongs for blind rivets which comprise a movable tongs leg and a tongs housing. A receiving mouth piece is provided for a riveting thorn of a blind rivet, and serving as a rotary bearing for the movable tongs leg. A chuck mechanism for gripping said riveting thorn is arranged and an intermediate lever is pivotally connected with the movable tongs, the intermediate lever engages the chuck mechanism and has an abutment for contacting the movable tongs leg.

[ Jan. 1, 1974 United States Patent [1 1 Bosch Henshaw.....

S N MT A m m ML "D1 P. A m R @0 m c F m T A P N m E R O FElliott........ Keymer....... Hinden WWMWU 05779 08224 v 4868 22746 ,3.5 33333 Internationale Mit Beschrankter Haftung, Frankfurt am Main,Germany 561,417 5/1944 Great Britain........................ 72/39l [22]Filed: Apr. 26, 1971 Primary ExaminerRichard J. Herbst AssistantExaminer-Gene P. Crosby Att0rney-Ernest G. Montague [21] Appl. No.:137,535

[57] ABSTRACT Hand riveting tongs for blind rivets which com movabletongs leg and a tongs housin [30] Foreign Application Priority Data Apr.24, I970 prise a g. A receiving g thorn of a blindGermany................... P 20 19 954.6

mouth piece is provided for a rivetin and serving as a rotary bearingfor the movable leg. A chuck mechanism for gripping said rivetorn isarranged and an intermediate lever is pivotally connected with themovable tongs, the intermediate lever engages the chuck mechanism andhas an abutment for contacting the movable tongs leg.

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to a o 884 UImnM 744 1 1 22 ewe Ne l 333 1 RIVETING TONGS FOR BLINDRIVETS The present invention relates to a hand riveting tongs for blindrivets, the one tongs leg of which, also designated as a tongs housing,carries the receiving mouth piece for the rivet thorn and serves as arotary bearing for the other movable tongs leg, the power tongs leg,which effects the clamping device of the riveting thorn, the chuckmechanism.

Riveting tongs in the most different embodiments have been known, whichassume an automatic fixing and ejecting of the draw shaft and warrant afull exportation of the applied energy as well as a drawing directionperpendicular to the parts to be riveted, in order to avoid a shearingof the drawing shaft. In tongs with the above named characteristics, theclamping-piececarrier of the chuck mechanism for the blind rivet formsthe one side of a pivoted pentagon having five pivot points and formingin the starting position a parallelogram.

Disadvantageous on this, as well astof other types of riveting tongs arethe comparatively high power requirements for the service man, theappreciable return shock occurring during the tearing of the rivetingthorn, as well as friction losses and the lacking resistance to wearresulting therefrom.

It is therefore, one object of the present invention, to provideriveting tongs for blind rivets obtaining a still better transmissionand a damping of the return shock with simultaneous wear resistance. Ashand'riveting tongs it is also in the position, to work stronger rivets.

In accordance with the present invention hand riveting tongs areprovided, in which an intermediate lever is pivoted on the movable tongsleg, the power tongs leg, which intermediate lever engages on the onehand the chuck mechanism and on the other hand has an gages laterally.in recesses, by example, annular grooves, of the chuck mechanism, Theworking end of the intermediate lever can be formed,however, also as apin, preferably with aball-shaped end, which enters likewisearecess,.particularlyin a passage opening of the chuck mechanism. Thisembodiment is to beproduced in a particularly simple manner. In bothcases the-movable tongs leg is formed fork-like at its forward end andgrips around therebytheintermediate lever,ln order to achieveafork-likeformation of the working end of the intermediate lever, thelatter can be also divided, so thatit consists of two levers, which, onthe one hand, diametricallyidisposed opposite eachother enter at theworking ends the recess of the chuck mechanism and are connectedtogether, on the other hand, at the free end directly on over across-stay. Thisembodiment is also comparatively simple concerning themanufacturing technic. If an intermediate lever is shown which consistsoftwolevers, it is alsopossible, to connect the levers on the workingend, so that there is formed a pin. This embodiment has the advantage,

that it can bebuilt into conventionalriveting tongs in a simple manner,and the latter can bev reequipped into riveting tongs according to thepresent invention. If the intermediate lever consists of two levers, itis suitably formed fork-like for gripping around of a one-piece movabletongs leg.

The intermediate lever is pivotally connected, in accordance with thepresent invention, with the movable tongs leg by means of a bolt and isrotatably mounted preferably at its free end by means of a further bolton the tongs housing. This further bolt enters suitably into alongitudinal slot provided in the intermediate lever, so that also acertain horizontal movement of the intermediate lever is possible.

In accordance with the present invention, preferably, the free end ofthe intermediate lever is formed as abutment. The abutment can beprovided, however, also between the pivot point for the tongs leg andthe free end of the intermediate lever on the latter. If theintermediate lever consists of two levers, advantagously the latter isformed as abutment in care of a direct connection at the free end or incase of a connection of both lever ends by means of a cross stay.

The arrangement, in accordance with the present invention, of anintermediate lever causes, in a surprising manner, with a simplestructure, a reduction of the power requirement during riveting andreduces the friction, since the bearing pressures on the chuck mechanismare extensively reduced. The working-physiological important clamping ofthe backshock upon tearing of the riveting thorn results from the fact,that the back-shock is exerted upon the lever system. In addition alsostronger rivets can be worked thereby. It is obvious, that the presentinvention makes possible a faster and more rational riveting andenlarges the range of application of the hand riveting tongs.

With these and other objects in view, which will be- .come apparent inthe following detailed description,

the present invention, which is shown by example only, will be clearlyunderstood in connection with the accompanying drawings, in which:

FIG. 1 is a side elevation of the hand riveting tongs, designed inaccordance with the present invention, with closed tongs legs with thechuck mechanism partly in section;

FIG. 2 is a side elevation with opened tongs legs with the chuckmechanism likewise partly in section;

FIG. 3 is a longitudinal section along the lines Ill-Ill of FIG. 1; and

FIGS. 4, 5 and 6 are longitudinal sections of further embodiments of thepresent invention corresponding with FIG. 3

Referring now to the drawings, and in particular to FIGS. 1 and 2, thehand riveting tongs comprises a tongs leg 1 serving as tongs housing anda movable tongs leg 2. At its forward end the tongs housing terminatesinto an end formed like a hitting part of aharnmer. This head la formedas a hammer-like projection is inclined with its vertical axis to thehorizontal axis of the tongs housing 1, whereby a closer access to theriveting station is madepossible. The head la is the guide for the chuckmechanism 4, formed as a bushing, whereby the chuck mechanism-receivesthe two-part chuck jaws 3, the pressure bushing 6 and the pressurespring 7 and is closed up by the closing screw 8. The receivingmouth-piece 10 for the rivet 11 is clearly shown inFIGS. 1 and2.-Further mouth-pieces ,10a and 10b are provided in the bushings of thetongs leg 1.

,The intermediate lever 9, designed in accordance with the presentinvention, is disposed between the side walls of the tongs leg 1 whichis U-like forked at the forward end. The forward or working end 9a ofthe lever is formed fork-like and enters a recess 4a of the chuckmechanism 4. The rear free end of the intermediate lever 9 is formed asabutment 9b for the tongs leg 2. The tongs leg 2 hits the abutment 9bupon drawing a break of the shaft of the rivet thorn and causes therebya damping of the back-shock created thereby. This damping is broughtabout by the arrangement on the intermediate lever, different from anarrangement, in which the abutment 9b is provided on the tongs housing.It can be increased, if the abutment is displacedtowards the pivot 12.

The power tongs leg 2 is rotatably mounted on the tongs housing 1 bymeans of a bolt 13, which passes through a slot 14 of the intermediatelever. This slot 14 is a longitudinal slot curved corresponding with therotary movement of the tongs leg 2, which longitudinal slot thus renderspossible the lifting movement of the intermediate lever 9. The tongslever 2 is pivoted to the intermediate lever 9a by means of a bolt 12.The lever translation, obtained by the arrangement of the presentinvention, reduces the power requirement during riveting. Theintermediate lever 9 is movably mounted at its free end by means of afurther bolt 15 on the tongs housing. For this purpose the intermediatelever 9 is equipped with a slot 16 for additional longitudinal movement.The bolts 13 and 15 are disposed in one plane. Grips 17 and 18,preferably of synthetic material and equipped with abutment cams, aresecured to the housing tongs l and the tongs leg 2, for providing abetter gripping.

In the side elevation of FIG. 2, the tongs are shown in open position,whereby the chuck mechanism is open for insertion of the rivet 11through the mouth piece 10. The bolt 13 is then at the upper end of theslot 14.

FIG. 3 shows a longitudinal section along the lines III- -III of FIG. 1.The intermediate lever 9 is formed forklike at its working end 9a andenters an annular groove 4a of the chuck mechanism 4. The movable tongsleg 2 is likewise formed fork-like at one of its ends and grips aroundthe intermediate lever 9.

FIGS. 4, and 6 disclose further embodiments of the present invention inlongitudinal sections similar to that shown in FIG. 3. In FIGS. 4 and 6the intermediate lever 29 and 49, respectively, consists of two levers.The working end 290 is formed in FIG. 4 fork-like and entersdiametrically opposite an annular groove 24a of the chuck mechanism 4,while the free end of the two levers is directly connected and has theabutment 29b. In FIG. 6 the working end 49a is connected pin-like andenters a passage opening 44a in the chuck mechanism. The free ends ofthe lever 49 are connected by a crossstay 49b which is simultaneouslyformed as an abutment. Cross-stay 49b does not extend beyond the sidesof levers 49, and overlies bolt as illustrated in in FIG. 6. FIG. 5shows in the simplest form, in the production-technical sense, of theone-piece intermediate lever 39 with the pin-shaped working end 39awhich enters a passage opening of the chuck mechanism 4. while the freeend 39b is formed again as abutment. In the embodiments shown in FIGS. 3and 5, the end of the movable tongs leg 2 and 32, respectively, isforked and grips around the intermediate lever 9 and 39, respectively,while in the embodiments of FIGS. 4 and 6 the lever 29 and 49,respectively, grips around the one-piece end of the movable tongs leg 22and 42, respectively. The end of the pin 39a and 49a, respectively, cansuitably be also of ball-shape in the embodiments shown in FIGS. 5 and6.

By these different modifications of the intermediate lever and of themovable tongs leg, the connection thereof takes place by the bolt 12,while the intermediate lever is rotatably mounted on the tongs housing 1by means of the further bolt 15. The movable tongs leg 2 is rotatablymounted on the tongs housing 1 by means of the bolt 13. The shape of theintermediate lever 9 can be chosen in any manner. The lengths of theintermediate lever are variable in the cooperation with the movabletongs leg 2 and the chuck mechanism, whereby the ratio of the powertransmission can be influenced.

While I have disclosed several embodiments of the present invention, itis to be understood that these embodiments are given by example only,and not in a limiting sense.

I claim:

1. Hand riveting tongs for blind rivets comprising a movable tongs legand a tongs housing,

a receiving mouth piece for a riveting thorn ofa blind rivet,

said movable tongs leg being pivotally mounted on said tongs housing,

a chuck mechanism for gripping said riveting thorn,

an intermediate lever pivotally connected by a pivot point with saidinovable tongs, and having an operating end and a free end, and

said intermediate lever engaging said chuck mechanism and having anabutment.

2. The hand riveting tongs for blind rivets, as set forth in claim 1,wherein the operating end of said intermediate lever engaging said chuckmechanism and enters in recesses of said chuck mechanism.

3. The hand riveting tongs for blind rivets, as set forth in claim 1,wherein said operating end of said intermediate lever forms a pin with aball-shaped end and enters a recess of said chuck mechanism.

4. The hand riveting tongs, as set forth in claim 1, wherein saidintermediate lever comprises two levers which enter recesses of saidchuck mechanism and further includes connecting means for jointoperation of said two levers.

5. The hand riveting tongs, as set forth in claim 4, wherein saidconnecting means comprises a cross stay.

6. The hand riveting tongs, as set forth in claim 1, wherein saidintermediate lever is of fork-shape and grips around said movable tongs.

7. The hand riveting tongs, as set forth in claim 1, which includes abolt connecting pivotally said intermediate lever with said movabletongs.

8. The hand riveting tongs, as set forth in claim 1, wherein said freeend of said intermediate lever is formed as an abutment means.

9. The hand riveting tongs, as set forth in claim 1, wherein end bymeans of said additional bolt. 12. The hand riveting tongs, as set forthin claim 11 wherein said bolt enters a longitudinal slot of saidintermediate lever. 13. The hand riveting tongs, as set forth in claim4, wherein said two levers are in contact with each other at leastpartly.

Patent No. 3,782,165 Dated January 1, 1974 Inventor-(s) K Bosch It iscertified that error appears in the above-identified patent and thatsaid Letters Patent are hereby corrected as shown below;

On the cover sheet [73] Assignee: "Gesipa, Gesellschaft FurInternationalelMitBeschrankter Haftung, Frankfurt am Main, Germany"should read Gesipa, Gesellschaft Fur Internationale Patentverwertung.Mit Beschrankter Haftung, Frankfurt/Main,

Germany, a corporation of Germany Signed and sealed this 3rd day ofSeptember 1974.

(SEAL) Attest:

MCCOY GIBSONQJR. c. MARSHALL DANN Attestlng Officer Commissioner ofPatents FORM PO-1050 (10-69) I USCOMWDC memes a 0.5. aovznuusm' PRINTINGOFFICE uses o-ass-ssa,

1. Hand riveting tongs for blind rivets comprising a movable tongs legand a tongs housing, a receiving mouth piece for a riveting thorn of ablind rivet, said movable tongs leg being pivotally mounted on saidtongs housing, a chuck mechanism for gripping said riveting thorn, anintermediate lever pivotally connected by a pivot point with saidmovable tongs, and having an operating end and a free end, and saidintermediate lever engaging said chuck mechanism and having an abutment.2. The hand riveting tongs for blind rivets, as set forth in claim 1,wherein the operating end of said intermediate lever engaging said chuckmechanism and enters in recesses of said chuck mechanism.
 3. The handriveting tongs for blind rivets, as set forth in claim 1, wherein saidoperating end of said intermediate lever forms a pin with a ball-shapedend and enters a recess of said chuck mechanism.
 4. The hand rivetingtongs, as set forth in claim 1, wherein said intermediate levercomprises two levers which enter recesses of said chuck mechanism andfurther includes connecting means for joint operation of said twolevers.
 5. The hand riveting tongs, as set forth in claim 4, whereinsaid connecting means comprises a cross stay.
 6. The hand rivetingtongs, as set forth in claim 1, wherein said intermediate lever is offork-shape and grips around said movable tongs.
 7. The hand rivetingtongs, as set forth in claim 1, which includes a bolt connectingpivotally said intermediate lever with said movable tongs.
 8. The handriveting tongs, as set forth in claim 1, wherein said free end of saidintermediate lever is formed as an abutment means.
 9. The hand rivetingtongs, as set forth in claim 1, wherein said abutment means is disposedon said intermediate lever between said pivot point for said movabletongs and said free end of said intermediate lever.
 10. The handriveting tongs, as set forth in claim 4, wherein said connecting meansis formed as an abutment means.
 11. The hand riveting tongs, as setforth in claim 1, wherein an additional bolt, and said intermediatelever is mounted movably on said tongs housing at said free end by meansof said additional bolt.
 12. The hand riveting tongs, as set forth inclaim 11 wherein said bolt enters a longitudinal slot of saidintermediate lever.
 13. The hand riveting tongs, as set forth in claim4, wherein said two levers are in contact with each other at leastpartly.